Just a thought. I'd ring your local education department or the education welfare officer/education social worker who covers your area. Reading the replies on here, there seems to be discrepancies on the attendance percentages. Your LEA should clarify this.
Where I live, the attendance percentage cut off point for allowing holidays is 90%. This purely for the CURRENT year, and the previous years attendance is not taken into account, unless it's spectacularly low. Again, you should be able to clarify this.